Willcutt, R. E., Spikell, M. A., & Greenes, C. E. (1974). Multibase activities. Creative Publications.
Lua i Stíl Chicago (17ú heag.)Willcutt, Robert E., Mark A. Spikell, agus Carole E. Greenes. Multibase Activities. Palo Alto, Ca.: Creative Publications, 1974.
Lua MLA (8ú heag.)Willcutt, Robert E., et al. Multibase Activities. Creative Publications, 1974.
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